"""
MIT License

Copyright (c) 2020 Airbyte

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
"""

import json
import os
import pkgutil
from collections import defaultdict
from typing import Dict, Generator

from airbyte_protocol import AirbyteCatalog, AirbyteConnectionStatus, AirbyteMessage, ConfiguredAirbyteCatalog, ConnectorSpecification

from .logger import AirbyteLogger


class AirbyteSpec(object):
    @staticmethod
    def from_file(file: str):
        with open(file) as file:
            spec_text = file.read()
        return AirbyteSpec(spec_text)

    def __init__(self, spec_string):
        self.spec_string = spec_string


class Integration(object):

    # can be overridden to change an input config
    def configure(self, config: json, temp_dir: str) -> json:
        """
        Persist config in temporary directory to run the Source job
        """
        config_path = os.path.join(temp_dir, "config.json")
        self.write_config(config, config_path)
        return config

    @staticmethod
    def read_config(config_path: str) -> json:
        with open(config_path, "r") as file:
            contents = file.read()
        return json.loads(contents)

    @staticmethod
    def write_config(config: json, config_path: str):
        with open(config_path, "w") as fh:
            fh.write(json.dumps(config))

    # can be overridden to change an input catalog
    def read_catalog(self, catalog_path: str) -> ConfiguredAirbyteCatalog:
        return ConfiguredAirbyteCatalog.parse_obj(self.read_config(catalog_path))

    # can be overridden to change an input state
    def read_state(self, state_path: str) -> Dict[str, any]:
        if state_path:
            state_obj = json.loads(open(state_path, "r").read())
        else:
            state_obj = {}
        state = defaultdict(dict, state_obj)
        return state

    def spec(self, logger: AirbyteLogger) -> ConnectorSpecification:
        """
        Returns the spec for this integration. The spec is a JSON-Schema object describing the required configurations (e.g: username and password)
        required to run this integration.
        """
        raw_spec = pkgutil.get_data(self.__class__.__module__.split(".")[0], "spec.json")
        return ConnectorSpecification.parse_obj(json.loads(raw_spec))

    def check(self, logger: AirbyteLogger, config: json) -> AirbyteConnectionStatus:
        """
        Tests if the input configuration can be used to successfully connect to the integration e.g: if a provided Stripe API token can be used to connect
        to the Stripe API.
        """
        raise Exception("Not Implemented")

    def discover(self, logger: AirbyteLogger, config: json) -> AirbyteCatalog:
        """
        Returns an AirbyteCatalog representing the available streams and fields in this integration. For example, given valid credentials to a
        Postgres database, returns an Airbyte catalog where each postgres table is a stream, and each table column is a field.
        """
        raise Exception("Not Implemented")


class Source(Integration):
    def __init__(self):
        super().__init__()

    def read(
        self, logger: AirbyteLogger, config: json, catalog: ConfiguredAirbyteCatalog, state_path: Dict[str, any]
    ) -> Generator[AirbyteMessage, None, None]:
        """
        Returns a generator of the AirbyteMessages generated by reading the source with the given configuration, catalog, and state.
        """
        raise Exception("Not Implemented")


class Destination(Integration):
    def __init__(self):
        super().__init__()
